Chick-fil-A is back in the spotlight after Sen. Lindsey Graham vowed to “go to war” for the fast-food company. But how exactly did a chicken sandwich restaurant become such a lightning rod of political division?

Chick-fil-A prides itself on its signature chicken sandwich, featuring freshly battered boneless breasts served with dill pickles and toasted buns. Its business model has been emulated by several companies — including Popeyes, Wendy’s, and McDonald’s — but its food is not what gets liberal critics going. Rather, it is the past corporate donations and the political and religious views of its founder and current CEO.